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Table 5 The proportion of students who reported having ever used cannabis, meth/amphetamine or ecstasy in their lifetime for the intervention and control groups over time (95% confidence intervals and sample size)

From: A universal harm-minimisation approach to preventing psychostimulant and cannabis use in adolescents: a cluster randomised controlled trial

   Baseline Post-intervention Five month follow-up 10 month follow-up
Proportion ever used cannabis Control 0.15 0.16 0.16 0.20
(0.13-0.17) (0.13-0.19) (0.13-0.19) (0.16-0.24)
(n = 828) (n = 580) (n = 450) (n = 403)
Intervention 0.09 0.11 0.13 0.12
(0.07-0.11) (0.09-0.13) (0.10-0.16) (0.09-0.15)
(n = 903) (n = 627) (n = 614) (n = 570)
Proportion ever used meth/amphetamine Control 0.05 0.06 0.07 0.05
(0.04-0.06) (0.04-0.08) (0.05-0.09) (0.03-0.07)
(n = 827) (n = 577) (n =449) (n = 403)
Intervention 0.04 0.03 0.05 0.04
(0.03-0.05) (0.02-0.04) (0.03-0.07) (0.02-0.06)
(n = 906) (n = 627 (n = 613) (n = 570)
Proportion ever used ecstasy Control 0.07 0.09 0.09 0.07
(0.05-0.09) (0.07-0.11) (0.07-0.12) (0.05-0.09)
(n = 827) (n = 580) (n = 449) (n = 403)
Intervention 0.05 0.05 0.06 0.06
(0.04-0.07) (0.03-0.06) (0.04-0.08) (0.04-0.08)
(n = 904) (n = 627) (n = 614) (n = 569)